Hi,i am currently using dymax glass hydrometer which is a hydrometer which bobs in the water. When i did a partial water change 2 days ago,i checked the salinity level and it was fine but when i checked it today,the salinity level has dropped! I don't know whats wrong because i had placed a marker to indicate my water level when i did the pwc
and the water level currently is below that marker so the salinity should be higher but mine is dropping. Is there something wrong with my hydrometer or what???